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I Patented Feb. l4, I899. J. W. DUDLEY. PISTON ROD PACKING.

(Application filed D c. 28,

(No Model.)

NITED STATES JOHN W. DUDLEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN C.WILLIAMS,

OF SAME PLACE.

PISTON-ROD PACKING.

SPECIFICATION forming part of Letters Patent No. 619,468, dated February14, 1899.

Application filed December 28, 1897. serial No. 663,870. (No model.)

To all whom it may concern:

Be it known that 1, JOHN W. DUDLEY, of Chicago, Illinois, have inventedcertain new and useful Improvements in Piston Rod Packings, of which thefollowing is a specification.

My invention relates to certain improvements in rod-packings, and isshown in the accompanying drawings in the preferred form ofconstruction,which may,however, be modified as to structural detailswithout departing from the spirit of my invention.

The object of my invention is to provide a packing which shall beeconomical in construction, durable in use, efficient, and which willnot introduce or occasion undue friction.

To this end my invention consists in a piston-rod packing preferablymade up in the form of a ring or annulus, the body of which is composedof a soft metal, such as lead, substantially of U or horseshoe shapeincross-section, and inclosing within such bodya fillingmaterial,preferably a lubricant, such as plumbago. To retain the ring initsimparted form and the filling material in place, I may wrap or incasethe ring with a fabric or other covering in the form of a tube or tape.

In the accompanying drawings, Figure 1 is a plan view of abroken portionof a rod sectional through a stuffing-box, showing three of the ringsapplied thereto, one of the latter being in broken section. Fig. 2 showsthe ring in an incomplete stage of manufacture; Fig. 3, a completedring, and Fig. 4 one of the rings with its ends separated and its bodytwisted to enable it to be applied to the rod intermediate the ends ofthe latter.

In the drawings let A represent the head of a stuffing-box, and B thegland thereof.

C is the rod.

The packing-ring is composed of the softmetal body D, which may beobtained in the form of a sheet and bent into U shape in cross-section.

E represents a body of filling material, preferably a lubricant, such asplumbago, and F the fabric, jacket, or wrapper, which is most convientlyapplied in the form of a tube, but which may be wound spirally aroundthe metal body and its core in the forrnof a tape.

The ring when completed has a flattened side, the edges of the metalbodyD presented toward the rod or other moving part. As the wearprogresses the rings will be laterally compressed, thus causing theirsides to approximate, and as the lubricant and the edges of the metalbody wear away the transverse diameter of the ring will be decreased bythe pressure of the gland of the stuffing-box,while a suitably tightjoint will be at all times maintained by the corresponding elongation ofthe opposite diameter of the ring. The cross-section which I prefer toemploy is substantially U-shaped, so that the edges of the ring, as wellas the lubricant inclosed therein, contact with the rod.

I have found in use that this packing-ring is highly efficient andeconomical.

I claim- A piston-rod packing comprising essentially a metal body ofannular'form curved in cross-section, the edges of the section beingseparated to provide an opening between them and adapted to contact withthe rod, and a suitable filling material embraced within the cavity ofthe body and also adapted to contact with the rod, substantially asdescribed.

JOHN W. DUDLEY. WVitnesses:

C. 0. LINTHIOUM, E. L. HUBER.

